JEE Class main Answered
1)WHICH OF FOLLOWING CAN BE USED IN THE ADD SUSPENSION SYSTEM IN ROVER?
A)SYRINGE b)pencil c) button pen d)both a and c
2)WHY SPACE CRAFT HAVE NO WINGS?
A)WINGS ARE REMOVED FROM SPACE ROCKET TO REDUCE WEIGHT
B)WINGS PROVIDE MORE MOMENTUM BY ITS WEIGHT TO FACE AIRDRAG
C)WINGS ARE USED TO MAKE AIRCRAFT LOOKS BETTER ONLY
D)WINGS STABILIZES THE AIRCRAFT IN VARIOUS AIR DRAG
3) RAM WANTS TO MAKE AN OBJECT THAT CANNOT BE DETECTED BY ROBOT WHO DETECTS ANY MATERIAL BASED ON PRINCIPAL OF REFLECTION OF LIGHT. THIS PURPOSE CAN BE FULFILLED BY JUST PAINTING THE OBJECTS OUTER SURFACES WITH A COLOR Z .IDENTIFY Z?
A)RED B)WHITE C) BLACK D) BLUE
4)A SOLUTION OF OUR EXHALED AIR AND WATER WAS TESTED BY USING A pH SENSOR.WHAT WOULD BE THE RANGE OF pH sensor screen?
a)less than 7 b) more than 7 c) depends on initial ph d)none
Asked by KUNDU3541 | 14 Aug, 2019, 16:37: PM
Expert Answer
(1) For suspension system spring action is required.
A syringe , when its exit hole is blocked, will give spring action when is piston compress the air and also when the piston is released.
Hence a syringe can be used for suspension system in air, if its exit hole is blocked and there is no air leak through piston.
Pencil do not give any spring action. Button pen works like spring when it is compressed but too much of compression locks the spring action.
(2) Aircraft have wings in order to maneuver in different kind of weather and change direction.
But spacecraft moves in outer space where there is a vacuum. Hence no need to have wings for space craft.
(3) Black color should be used to eliminate the reflection of light
(4) Solution of exhaled air and water means mixture of air and carbon-di-oxide. pure water has pH 7,
whereas dissolved carbon-dioxide reduces the pH of mixture to less than 7 . Hence the range should be less than 7
Answered by Thiyagarajan K | 14 Aug, 2019, 21:59: PM
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